Priming mixture



Patented June l8, l

mm: STATES PATENT OFFICE mums mx'rmtn Joseph B. McNutt, New Haven; Conn., assignor to Winchester Repeating Arms Company, New Haven, Conn a corporation oi. Maryland No' Drawing. ApplicationMarch a1, 1934,

. e $erial No. 718,517

dinitrophenylazide. While the salts of barium,

strontium, sodiumand potassium may be used to advantage, I prefer to use the potassium salt of dinitrophenylazide. Any of the well knowr'i '15 oxidizersand fuels can be used with potassium dinitrophenylazide in proper combinations and proportions to produce operable priming mixtures. e The potassium dinitrophenylazide may' be prepared by dissolving. 100 grams for diazodinitrophenol in-1200 cc. of acetone. Tothis solution I then add a solution consisting of 30 grams of potassium azide dissolved in 300- cc. of water. The heat of the solution should be maintained below 50C; The addition of the potassium azide solution causes a reaction resulting in the for- 'mation of potassium dinitrophenylazide. The potassium dinitrophenylazide is precipitated from the, solution whichmay be cooled and filtered to obtain the potassium dinitrophenylazide.

Itmay then be washed with water. The dinitrophenylazide salts of bariumfstrontium and sodium may be prepared in the same way substituting the corresponding azide for potassium azide in the above procedure' As a specific example of a-center fire priming 1 mixture employing potassium dinitrophenylazide I may employ; V

Percent Potassium dinitrophehylazide- 16 Basic lead trinitroresorcinol 15 Barium nitrat 40 Antimony sulphide 29 ture ingredients. Substantially all alkali and ture I may employ the following ingredients in substantially the following proportions:

, 4 Percent Potassium dinitrophenylazide 17 Basic lead trinitroresorcinol 18 5 Barium nitrate 35 Lead sulphocyanate 5 Ground glass; j 25 The ingredients are thoroughly mixed and then the mixture is made into pellets of the proper weight in the usual manner. These-pellets are spun into the rims of cartridge shells in'the usual manner and the cartridge. shells may then be loaded with propellent powder and bullets to com:

plete the cartridge.

Thesuperiority of the 15 alkali and alkaline earthsaltsv of dinitrophenylazide over the heavy metal salts of dinitrophenylazide in'priming mixtures I v is contrary to the usual behavior of priming mix- 20 alkaline earth salts are soluble in water and are hygroscopic, They. are therefore not useful for the preparation of priming mixtures which are loaded into cartridges and which.must be capable 0t withstanding all sorts of weather conditions without decomposition. The corresponding salts of the heavy metalsfhave heretofore been used in the preparation of priming mixtures, such for instance, as lead styphnate, 30 lead azide and the like. I

Potassium dinitrophenylazide; on the other hand, is admirably suited for use in priming mix tures. It is relatively insoluble in water, has a higher ignition temperature than leaddinitro- 35 phenylazide and is thereforemore stable. As a v I further advantage it produces amolten residue upon decomposition and it has been found that primingmixture components which produce a molten mass'result in better ignition oi the pro- 40 pellent powder.

I claim: l. Apriming mixture comprising an alkali or an alkaline earth salt of dinitrophenylazide.

.2. A priming mixture comprising potassium dinitrophenylazide.

3. A priming mixture comprising barium di- 'nitrophenylazide.

4. A priming mixture comprising strontiu'm dinitrophenylazide.

5. A priming mixture comprising potassium dinitrophenylazide and basic lead trinitroresorcinol.

6. A priming mixture comprising potassium 5 dinitrophenylazide, basic lead trinitroresorcinol and barium nitrate.

7. A priming mixture comprising potassium dinitrophenylazide, basic lead trinitroresorcincl, barium nitrate and a fuel.

8. A priming mixture comprising substantially 16 percent of potassium dlnitrophenylazide, sub

stantially 15 percent basic lead trinitroresorcinol, substantially 40 percent barium nitrate and substantially 29 percent antimony sulphide.

9. A priming mixture comprising substantially 17' percent potassium dinitrophenylazide, sub-'- stantially 18 percent basic lead trinitroresorcinol, substantially 35 percent barium nitrate, substantially 5 percent lead sulphocyanate and substantially 25 percent ground glass.

J OSEPH D. MCNUTT. 

